run-tests: error out on `--local --with-[c]hg`
I don't see much reason to allow these combinations. You could use
--local and override only one of --with-hg or --with-chg, but I don't
see much practical use for that. It would be easy to work around
anyway by passing both --with-hg and --with-chg. By erroring out, it
makes the code a bit easier to reason about to allow the next few
patches.
Differential Revision: https://phab.mercurial-scm.org/D6759
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}